Sanja Partalo

Co-Founder and GP at S4S Ventures | Investor in Runway, Higgsfield, Newton Research I AI, Media & Marketing I Corporate Board Director

📍 United States🔄 Updated October 2026💼 12 investments📅 10 years investing🗓 Last invested Aug 2026
VC🌍 United StatesInvested this quarter
12
Total investments
3
Early stage
4
Mid stage
4
Late stage
10y
Years active

Portfolio

12 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Aug 2026
Nex is helping families reconnect with the joy of movement through fun, social, and interactive content that’s accessible to all ages. Its award-winning Nex Playground console, launched in December 2023, uses cutting-edge AI, mobile and vision technologies to merge digital and physical worlds, immersing players in the experience using their natural body movement. Nex Playground games range from original sports and fitness titles, to educational games and titles in collaboration with Hasbro and Sesame Workshop. Since its founding, Nex has been recognised as one of Fast Company’s Most Innovative Companies, TIME’s Best Inventions, Parents’ Best Entertainment System for Families, and has been awarded the prestigious Apple Design Award. Nex Playground is also kidSAFE+ COPPA certified, highlighting the company’s firm stance on privacy and safety for kids and families. To learn more, visit https://www.nex.inc or follow us on Instagram and Facebook.
Investor
Aug 2026
Higgsfield is the ultimate production studio for creators by creators. 40% of our team are filmmakers, producers, and creatives who shape our product roadmap, working side by side with our ML engineers in a relentless creative feedback loop. Were on a mission to give everyone with a vision the tools of a world-class studio. Higgsfield is where your ideas become cinema.
Board Member
May 2026
Olyzon is the agentic CTV advertising platform delivering the attention leading global brands deserve on CTV. Built from the ground up with artificial intelligence, Olyzon’s AI agents advance automation, transparency, and scalable performance—empowering brands and agencies to take dynamic, intelligent action. The AI-native platform automates media planning across premium inventory, leverages contextual AI signals for proprietary program-level targeting and audience intelligence, and invites audience engagement with immersive ad formats and intelligent sequencing. Founded in 2024 with offices in Paris and New York, Olyzon helps advertisers maximize investments and brand impact that Thrive with All Eyes On CTV.
Investor
Aug 2025
Newton, the newest member of your analytics team.
Investor
Aug 2024
We are building AI to simulate the world through merging art and science. We believe that world models are at the frontier of progress in artificial intelligence. Language models alone won’t solve the world’s hardest problems – robotics, disease, scientific discovery. Real progress requires models that experience the world and learn from their mistakes, the same way that humans do. And this kind of trial and error can be massively accelerated when done in simulation, rather than in the real world. World models offer the most clear path to general-purpose simulation, changing how stories are told, how scientific progress is made and how the next frontiers of humanity are reached. https://runwayml.com/world-simulator
Board Observer
Jul 2024
Cambri is a plug-and-play consumer insights and concept testing tool that incorporates the most advanced market research methods and technology into a super easy to use interface. We make advanced consumer research easy, accelerate learning and amplify innovation. Our goal is to make people and brands shine.
Board Observer
Mar 2024
At Beam, we’re on a mission to shift $10B from brands to nonprofits by creating what loyalty would look like if it were designed for today’s customers. In the last year, we’ve funded 7M+ meals for food-insecure communities, the prevention of 2M+ lbs of CO2, and more. Across our network of 130+ mission-driven brands like Instacart, Roots Canada, and Parade, we let you make ~1% of every purchase go to a high-impact nonprofit you choose from a curated set reflecting what the brand stands for–at no extra cost. As customers see how their dollars are going towards goals, like funding the removal of 10K lbs of plastic from the ocean, Beam builds emotional buy-in. We lift cart completion rate by 17%, average order value by 15% and convert 30% more customers to make a second purchase within 90 days–building higher value relationships than flash sales, especially with millennials and Gen Z. Our work to help people turn their spending power into tangible impact every day has been recognized by TechCrunch, Forbes 30 Under 30 for Social Impact, SXSW, Cannes Lions, and more.
Board Member
Feb 2024
ID5 is redefining identity for digital advertising, building solutions where privacy and addressability work in sync. Its Adaptive Identity technology learns and adjusts, ensuring seamless recognition across media properties, devices, and channels. This allows media owners to unlock sustainable revenue, enables advertisers to deliver measurable results, and helps platforms to maximize data and inventory value. Founded in 2017 by industry experts, ID5 is driving the future of identity–connecting, evolving, and empowering the digital advertising ecosystem.
Board Observer
Jan 2024
tvScientific is the first and only CTV advertising platform purpose-built for performance marketers. The tvScientific platform makes TV advertising accessible and measurable for brands and apps of all sizes. tvScientific offers a self-managed solution that simplifies and automates TV buying and optimization, leveraging massive data to prove the actual value of TV advertising. The platform reaches 95% of AVOD inventory using proprietary, deterministic ID technology to measure ad exposure to outcomes in an approachable, radically transparent, and scalable way. An Idealab company, tvScientific was co-founded by senior executives with deep roots in programmatic advertising, digital media, and ad verification. The company is headquartered in El Segundo, California. For more information, visit https://www.tvscientific.com.
Board Observer, Investor
Mar 2023
A-Frame is building a portfolio of Talent-led brands designed to meet the everyday needs of underserved communities. We strive to create solutions for unaddressed problems that disproportionately impact millions of people, whether that be due to their ethnicity, their gender identity, their age, accessibility, or who they love. A-Frame’s portfolio includes Kinlo with Naomi Osaka, as well as the Proudly Company with Gabrielle Union and Dwyane Wade, with more brands coming soon. We are proud to build a team of passionate leaders who, at all levels, reflect the diversity of the communities we serve. We craft our corporate and brand level organizations to include those who are best at what they do. Our teammates are able to work remotely and we empathetically craft our schedules to allow us to live our lives, pursue our passions, and take care of our families, however we each define that.
mid stageManufacturing
Board Observer, Investor
Sep 2017
Gimlet Media is the premier digital media company focused on producing high quality narrative podcasts. You can hear the full story of Gimlet’s creation by listening to StartUp Season 1, which documents the founding of the company. In 2015, we were named one of the top 10 most innovative media companies in the world by Fast Company.
Investor
Sep 2016
Founded in 2014 with the goal of expanding the potential of immersive storytelling, Within creates, acquires, and distributes premium AR & VR experiences across web, mobile, console and headsets including Oculus Quest/Rift/Go, Samsung Gear VR, HTC Vive, Sony Playstation®VR, Google Daydream, and Xiaomi MiVR. With their deep expertise in multi-media narrative, Within creates tools, formats and proprietary software to differentiate its original content and enable future immersive media creators. Investors include Andreessen Horowitz, Temasek, Emerson Collective, 21st Century Fox, Raine Ventures, WME, Live Nation, Vice Media, Tribeca Enterprises, Annapurna Pictures, and Legendary Pictures. For more information go to www.with.in To view the best in virtual reality download the Within app for iOS or Android today.
Experience · 16 entries
All (16)
Investments (12)
Founder (1)
Board (7)
2026
Investor
Aug 2026
Nex is helping families reconnect with the joy of movement through fun, social, and interactive content that’s accessible to all ages. Its award-winning Nex Playground console, launched in December 2023, uses cutting-edge AI, mobile and vision technologies to merge digital and physical worlds, immersing players in the experience using their natural body movement. Nex Playground games range from original sports and fitness titles, to educational games and titles in collaboration with Hasbro and Sesame Workshop. Since its founding, Nex has been recognised as one of Fast Company’s Most Innovative Companies, TIME’s Best Inventions, Parents’ Best Entertainment System for Families, and has been awarded the prestigious Apple Design Award. Nex Playground is also kidSAFE+ COPPA certified, highlighting the company’s firm stance on privacy and safety for kids and families. To learn more, visit https://www.nex.inc or follow us on Instagram and Facebook.
Investor
Aug 2026
Higgsfield is the ultimate production studio for creators by creators. 40% of our team are filmmakers, producers, and creatives who shape our product roadmap, working side by side with our ML engineers in a relentless creative feedback loop. Were on a mission to give everyone with a vision the tools of a world-class studio. Higgsfield is where your ideas become cinema.
Board Member
May 2026
Olyzon is the agentic CTV advertising platform delivering the attention leading global brands deserve on CTV. Built from the ground up with artificial intelligence, Olyzon’s AI agents advance automation, transparency, and scalable performance—empowering brands and agencies to take dynamic, intelligent action. The AI-native platform automates media planning across premium inventory, leverages contextual AI signals for proprietary program-level targeting and audience intelligence, and invites audience engagement with immersive ad formats and intelligent sequencing. Founded in 2024 with offices in Paris and New York, Olyzon helps advertisers maximize investments and brand impact that Thrive with All Eyes On CTV.
2025
Investor
Aug 2025
Newton, the newest member of your analytics team.
2024
Investor
Aug 2024
We are building AI to simulate the world through merging art and science. We believe that world models are at the frontier of progress in artificial intelligence. Language models alone won’t solve the world’s hardest problems – robotics, disease, scientific discovery. Real progress requires models that experience the world and learn from their mistakes, the same way that humans do. And this kind of trial and error can be massively accelerated when done in simulation, rather than in the real world. World models offer the most clear path to general-purpose simulation, changing how stories are told, how scientific progress is made and how the next frontiers of humanity are reached. https://runwayml.com/world-simulator
Show all 16 entries ↓
Investment activity
2016–2026 · 12 investments
201612017120231202452025120263
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